Engine sound louder than normal

Afi • 7 September 2019

Recently engine noise louder than normal, not knocking or humming, just overall louder and a bit sluggish. Oil, plugs and air filter recently replaced but did not solve problem.  Pls help with troubleshoot - thanks


Louder than normal engine sounds is usually a matter of concern and it is not normal unless the vehicle is a bit too old. First off, see if the spark plugs are clean and not surrounded by dirt as that affects the performance. 

Moreover, check the mufflers as well as they are constantly exposed to heat and slowly their performance starts declining. Failing mufflers result in abnormal engine sounds. 

Other reasons may include dirty mass airflow sensor, malfunctioning oxygen sensors, leakage in exhaust manifold or a broken tail pipe. 


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